drivers/gpio/gpio-clps711x.c

   1 /*
   2  *  CLPS711X GPIO driver
   3  *
   4  *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/gpio.h>
  14 #include <linux/module.h>
  15 #include <linux/basic_mmio_gpio.h>
  16 #include <linux/platform_device.h>
  17
  18 static int clps711x_gpio_probe(struct platform_device *pdev)
  19 {
  20         struct device_node *np = pdev->dev.of_node;
  21         void __iomem *dat, *dir;
  22         struct bgpio_chip *bgc;
  23         struct resource *res;
  24         int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
  25
  26         if ((id < 0) || (id > 4))
  27                 return -ENODEV;
  28
  29         bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
  30         if (!bgc)
  31                 return -ENOMEM;
  32
  33         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  34         dat = devm_ioremap_resource(&pdev->dev, res);
  35         if (IS_ERR(dat))
  36                 return PTR_ERR(dat);
  37
  38         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  39         dir = devm_ioremap_resource(&pdev->dev, res);
  40         if (IS_ERR(dir))
  41                 return PTR_ERR(dir);
  42
  43         switch (id) {
  44         case 3:
  45                 /* PORTD is inverted logic for direction register */
  46                 err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
  47                                  NULL, dir, 0);
  48                 break;
  49         default:
  50                 err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
  51                                  dir, NULL, 0);
  52                 break;
  53         }
  54
  55         if (err)
  56                 return err;
  57
  58         switch (id) {
  59         case 4:
  60                 /* PORTE is 3 lines only */
  61                 bgc->gc.ngpio = 3;
  62                 break;
  63         default:
  64                 break;
  65         }
  66
  67         bgc->gc.base = id * 8;
  68         bgc->gc.owner = THIS_MODULE;
  69         platform_set_drvdata(pdev, bgc);
  70
  71         return gpiochip_add(&bgc->gc);
  72 }
  73
  74 static int clps711x_gpio_remove(struct platform_device *pdev)
  75 {
  76         struct bgpio_chip *bgc = platform_get_drvdata(pdev);
  77
  78         return bgpio_remove(bgc);
  79 }
  80
  81 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
  82         { .compatible = "cirrus,clps711x-gpio" },
  83         { }
  84 };
  85 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
  86
  87 static struct platform_driver clps711x_gpio_driver = {
  88         .driver = {
  89                 .name           = "clps711x-gpio",
  90                 .of_match_table = of_match_ptr(clps711x_gpio_ids),
  91         },
  92         .probe  = clps711x_gpio_probe,
  93         .remove = clps711x_gpio_remove,
  94 };
  95 module_platform_driver(clps711x_gpio_driver);
  96
  97 MODULE_LICENSE("GPL");
  98 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  99 MODULE_DESCRIPTION("CLPS711X GPIO driver");
 100 MODULE_ALIAS("platform:clps711x-gpio");